在直线趋势方程yt=a+bt中,如果b为负值,则这条直线呈()A、上升趋势B、下降趋势C、不升不降D、无法判定
在直线趋势方程yt=a+bt中,如果b为负值,则这条直线呈()
- A、上升趋势
- B、下降趋势
- C、不升不降
- D、无法判定
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